Question 11A.CQ.4: Concentrated nitric acid turns yellow on exposure to sunligh......
Concentrated nitric acid turns yellow on exposure to sunlight. Why ?
Step-by-Step
On exposure to sunlight, nitric acid decomposes into NO_2,\ O_2\ \text{and}\ H_2O. The presence of NO_2 in the partially decomposed nitric acid gives it yellow colour.
4 HNO _3(l) \longrightarrow 4 NO _2( g )+ O _2( g )+2 H _2 O (l)
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